Senior Frontend Developer

About Blostem Blostem is the banking infrastructure layer for India's fintechs. We power Fixed Deposits, Recurring Deposits, Bonds, and UPI credit-line products through a single SDK that lets platforms like MobiKwik, Upstox, Jupiter, Zerodha (27+ partners) plug into 10+ partner banks (Suryoday, Unity, Shivalik, Utkarsh) and NBFCs (Bajaj, Shriram, Mahindra) — live in 7 days, no upfront cost, revenue-share model. We replace the 3–5 engineers and ₹3–5 crore that fintechs would otherwise spend building bank integrations, KYC, and reconciliation themselves.

About the role On the frontend you'll own three surfaces: the partner dashboard that fintechs and banks use to manage deposit products, KYC flows, and reconciliation; the white-label embeddable web SDK that partners drop into their own apps to offer FDs and RDs; and internal ops / recon consoles used by our finance and operations teams. Every pixel touches money movement, customer KYC, or a regulator-watched journey. You'll need to ship fast without ever breaking the audit trail.

This is not a styling-only role — you'll own architecture, performance, accessibility, and the contract with backend. What you'll do Build and own the partner dashboard and internal ops/recon consoles in Next.js 15 (App Router) + TypeScript (strict mode) . Build and maintain the white-label embeddable web SDK that partners drop into their own React / Next.js apps - themeable, low-bundle, versioned, framework-friendly.

Design and ship KYC, deposit booking, and payment flows that work cleanly across desktop and mobile web. Every flow has compliance and conversion implications. Build component systems with Tailwind CSS, shadcn/ui, Radix primitives - accessible (WCAG 2.1 AA), themeable per partner brand, consistent across surfaces.

Wire real-time UIs for KYC progress, payment status, deposit booking, settlement state using WebSockets, SSE, optimistic state, and suspense boundaries. Manage server and client state cleanly using TanStack Query, Zustand / Jotai, React Server Components - pick the right tool per surface, don't dump everything into Redux. Write Vitest + Playwright tests for the parts that matter — KYC, money flows, audit-critical journeys.

Profile and fix real performance issues — Core Web Vitals, bundle size (critical for the embedded SDK), hydration cost, render storms. Use React Profiler and Chrome DevTools, not guesswork. Work hand-in-hand with backend on API contracts (OpenAPI / tRPC).

Push back when the contract is bad. Use Claude Code, Cursor, GitHub Copilot every day — for scaffolding, refactors, test generation, codebase Q&A. You should know when to trust the AI and when to override it.

Must have 5–8 years building production React apps. At least 2+ years on hooks-era React (18/19) and Next.js App Router . Deep TypeScript — generics, conditional types, discriminated unions, strict mode; you can read a .d.ts without flinching.

Strong CSS fundamentals — flexbox, grid, container queries, modern responsive patterns. Tailwind isn't a substitute for understanding CSS. Solid grasp of React Server Components, streaming SSR, server actions, edge runtime — and where each falls apart.

Experience shipping flows that handle PII, KYC, OTP, or money movement — you understand why error handling, idempotency on the client, and audit-grade logging matter. Comfort with WebSockets / SSE for live status surfaces (payment, KYC, booking). Experience integrating AI tools into your daily workflow — Claude Code, Cursor, GitHub Copilot, v0, Windsurf .

You can describe specific wins (e.g. "cut a 2-day refactor to 3 hours using Claude Code on a multi-file rename"). Eye for design. You don't need to be a designer, but you should look at a Figma and call out the half-baked bits.

Git fluency — rebasing, conflict resolution, atomic commits. Nice to have Built or shipped a white-label or embeddable SDK / widget consumed by external developers — versioning, bundle size, framework-agnostic concerns. Hands-on Indian fintech / banking UX — UPI, eKYC (Digio, IDfy, Hyperverge), Aadhaar OTP, Account Aggregator, NACH mandate flows.

Mobile — React Native / Expo or Flutter (Blostem ships SDKs across web, Android, iOS, Flutter). Accessibility at audit grade — WCAG 2.1 AA, screen-reader testing, keyboard nav. Animation work — Framer Motion, GSAP, Lottie .

Built or contributed to a design system used by 10+ engineers. Contributions to React, Next.js, shadcn, or similar OSS. Experience with Storybook, Chromatic, Playwright Component Testing .

How we work Ship daily. PRs in hours, not weeks. AI-first — every engineer has Claude Code + Cursor running.

If you're not using them, you're slower than the team. Direct feedback culture. We say "this isn't good enough" and we mean it kindly.

Money-correctness is non-negotiable. Speed is for everything else. No standup theater.

Async-first. Async-deep.